function duplicar(num){

return num*2
}
function saludar(){

alert(prueba.saludo);

}

function transparenciaCallback(id, opacStart, opacEnd, millisec,callback) { 
    //speed for each frame 
    var speed = Math.round(millisec / 100); 
    var timer = 0;
  
    //determine the direction for the blending, if start and end are the same nothing happens 
    if(opacStart > opacEnd) { 
        for(i = opacStart; i >= opacEnd; i--) { 
            setTimeout("changeOpacCallback(" + i + ",'" + id + "',"+ opacEnd + "," + callback + ")",(timer * speed)); 
            timer++; 
        }
     } else if(opacStart < opacEnd) { 
        for(i = opacStart; i <= opacEnd; i++) 
            { 
            setTimeout("changeOpacCallback(" + i + ",'" + id + "',"+ opacEnd + "," + callback + ")",(timer * speed)); 
            timer++; 
        }
     } 
 } 



function transparencia(id, opacStart, opacEnd, millisec) { 
    //speed for each frame 
    var speed = Math.round(millisec / 100); 
    var timer = 0;
    //var toVisible = true;

    //determine the direction for the blending, if start and end are the same nothing happens 
    if(opacStart > opacEnd) { 
        for(i = opacStart; i >= opacEnd; i--) { 
            setTimeout("changeOpac(" + i + ",'" + id + "')",(timer * speed)); 
            timer++; 
        }
        
        //toVisible = true;
        
        
        
    } else if(opacStart < opacEnd) { 
        for(i = opacStart; i <= opacEnd; i++) 
            { 
            setTimeout("changeOpac(" + i + ",'" + id + "')",(timer * speed)); 
            timer++; 
        }
        
       // toVisible = false;
        
        
    } 
    
    /*if(toVisible)
    {
        document.getElementById(id).style.visibility = 'hidden';
    }else{
        document.getElementById(id).style.visibility = 'visible';
    }*/
} 
function cambioImagenes(divid, imageid, imagefile, millisec) { 
    var speed = Math.round(millisec / 100); 
    var timer = 0; 
     //alert('hhh');
    //set the current image as background 
    document.getElementById(divid).style.backgroundImage = "url(" + document.getElementById(imageid).src + ")"; 
     
    //make image transparent 
   
    changeOpac(0, imageid); 
     document.getElementById(imageid).src = imagefile; 
    
     //fade in image 
    for(i = 0; i <= 100; i++) { 
        setTimeout("changeOpac(" + i + ",'" + imageid + "')",(timer * speed)); 
        timer++; 
    } 
    
} 
function changeOpacCallback(opacity, id,opacEnd,callback) { 
    var object = document.getElementById(id).style; 
    object.opacity = (opacity / 100); 
    object.MozOpacity = (opacity / 100); 
    object.KhtmlOpacity = (opacity / 100); 
    object.filter = "alpha(opacity=" + opacity + ")"; 
    if (opacEnd==opacity)
    {
            callback();
            
            }
}

//change the opacity for different browsers 
function changeOpac(opacity, id) { 
    var object = document.getElementById(id).style; 
    object.opacity = (opacity / 100); 
    object.MozOpacity = (opacity / 100); 
    object.KhtmlOpacity = (opacity / 100); 
    object.filter = "alpha(opacity=" + opacity + ")"; 
}

function cambioTransparencia(id, millisec) { 
    //if an element is invisible, make it visible, else make it ivisible 
    if(document.getElementById(id).style.opacity == 10) { 
        transparencia(id, 0, 100, millisec); 
    } else { 
        transparencia(id, 100, 0, millisec); 
    }
}